Arcs and Angles Circles

Front

What is an arc in a circle?

Back

An arc is a part of the circumference of a circle.

Front

What is the measure of a full circle in degrees?

Back

360 degrees.

Front

What is an angle?

Back

An angle is formed by two rays with a common endpoint called the vertex.

Front

What is the measure of a right angle?

Back

90 degrees.

Front

What is the measure of a straight angle?

Back

180 degrees.

Front

What is a central angle?

Back

A central angle is an angle whose vertex is at the center of the circle.

Front

What is the relationship between the central angle and the arc it intercepts?

Back

The measure of the arc is equal to the measure of the central angle.

Front

What is a chord in a circle?

Back

A chord is a line segment whose endpoints lie on the circle.

Front

What is a diameter?

Back

A diameter is a chord that passes through the center of the circle.

Front

What is a radius?

Back

A radius is a line segment from the center of the circle to any point on the circle.